Protozoal diseases complicating pregnancy, third trimester

This code signifies a protozoal infection, such as toxoplasmosis, malaria, or trichomoniasis, that is present and actively affecting a pregnant patient during her third trimester. It indicates that the protozoal disease is considered a complication of the pregnancy, requiring specific management and monitoring due to its potential impact on both the mother and the fetus.

Apply this code when a pregnant patient in her third trimester is diagnosed with a protozoal disease that is documented as complicating the pregnancy. This includes situations where the infection is newly diagnosed or an existing infection is being managed during this stage of gestation. Documentation should clearly state the specific protozoal infection and its relationship to the pregnancy.

• Always code the specific protozoal infection first (e.g., B50.0 for Plasmodium falciparum malaria).
• Ensure the medical record explicitly states "complicating pregnancy" or similar language to justify the use of an O-code.
• Verify the trimester of pregnancy is clearly documented to ensure the correct O98.6 subcategory is selected.